Lamp-base



. l. KEMBLE. LAMP BASE.

APPLICATION FILED MAY26|1916.

l f fz@ WILLIAM I. KEMBLE, OF SAN FRANCISCO, CALIFORNIA.

LAMP-BASE.

Application filed May 2G, 1916.

To kall lwhom z' may concern Be it known that I, VILLIAM I. KEMBLE, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented certain new and useful Improvements in Lamp-Bases; and I do hereby declare the following to be a full, clear, and exact description of the invention, such las will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to new and useful improvements in lamp bases and the principal object of the invention is to provide a base for electric lamps which is adapted to be secured in the lamp socket against removal.

Another object of the invention is to provide a lamp base which will effectively prevent lamps from being stolen or removed from their sockets by unauthorized persons.

A still further object of the invention is to provide a lamp which isswivelly mounted in the base so that the same may be turned in either direction without turning the lamp base.

llVith these and other objects in view, the invention consists in the novel combination and arrangement of' parts which will be fully set forth in the following specification and accompanying drawing, in which Figure 1 is a vertical section through a lamp socket and base, showing the base constructed in accordance with this invention,`

Fig. 2 is a vertical section through the lamp base showing the same removed from the socket, and- Fig. 3 is a side view in elevation of the wrench used in connection with the device.

Referring to the drawing the numeral 1 ydesignates the lamp socket provided with the usual threaded sleeve 2 and a central contact 8. As in the ordinary type of lamp socket it will be understood that the sleeve 2 forms one contact which cooperates with the central contact 3 in forming terminals for the lamp. The lamp base consists of an outer threaded'shell et and an inner shell 5. The outer threaded shell 41 of the lamp base extends below the threaded shell 2 of the lamp socket and is provided with the notch 6 in its lower edge, the use of which will appear as the description proceeds. The upper end of the threaded shell 2 is formed with the inwardly extending an- Specicaton of Letters Patent.

Patented May 4, 1920.

Serial No. 100,109.

nular flange 7, which is secured to the insulated body of the socket Ain the ordinary manner. The lamp, designated by the numeral 8, is provided with the main lamp base 9 which is surrounded by shell 5, which is of electrical conducting material and is connected to one terminal of the lamp filament.' Shell 5 has soldered or otherwise secured thereto contact wire springs 11 which are bent into arcuateshape and bear against the inner face of the shell 4 of the lamp base. The upper end of the shell f1 is formed with an inturned-annular flange 12 and the flange 12 is adapted to be positioned between the insulating plates to be more fully hereinafter described.

The central contactpost of the lamp base 9 is designated by the numeral 13 and extends from the bottom of said lamp base 9 upwardly through the insulating tube 14 provided at its inner end with the disk 15 of insulating material which is positioned betwen the flange 12 and the end of the base 9. A suitable insulating disk 16 engages the outer side of the flange 1,2 and this disk is formed on the outer end of the bushing 14:.

The main central contact 18 of the lamp is swiveled to the outer end ofthe central contact 13 of the lamp base 9 and bears against the contact 3 of the lamp socket 1 so as to conduct the current from the contact 8 into the lamp.

It will be apparent from the foregoing that in use the outer shell 4 is threaded into the lamp socket until the lower end of this shell is positioned inward of the lower end of the socket. A wrench designated generally by the numeral 19, which is provided with a groove 20 at its upper end, is adapted to be inserted into the notch 6 so that the legs formed by the groove 20 straddle the lower edge of the shell 5. The upper portion of this wrench is angularly disposed and is adapted to be inserted between the threaded shell 4: and the shell 5, so that the threaded shell 4 can be engaged to permit of the lamps being turned into proper position. Then the lamp is in operative position, the lamp bulb 8 may be turned in either direction without causing rotation of the lamp base, thus reducing possibilityof theft of the lamp to a minimum. To remove the lamp the wrench 19 is again inserted into the notch 6, as previously described, and upon reversing the rotation of ilo the shell it will be seen that the lamp base will be unscrewed from its position in the socket and the device may be readily removed.

While in the foregoing there has been shown and described the preferred embodiment of this invention, it is to be understood that such changes may be made in the combination and arrangement of parts as will fall within the spirit and scope of the appended claims.

Vhat is claimed 1. The combination with an incandescent lamp provided with a basehaving an outer casing of'electrical conducting material, one end of the filament of said lamp being connected to said casing, of a threaded member disposed concentric with said casing and electrically connected thereto, a socket provided with a threaded casing receiving the threaded member of said lamp base.y said socket being provided with a central contact, and a contact member connected to the other end of the filament of said lamp and adapted to engage the contact of the socket so as to establish electrical connection therewith, and means connecting the contact member and the threaded member to the base of the lamp so as to permit rota-l tion of the base in either direction independent of the threaded member and contact member.

2. The combination with a`lamp socket provided with a threaded shell and having a central contact member, of a lamp provided with a base insertible into said socket, a casing of electrical conducting material mounted on said base, one end of the filament of said lamp being connected to said casing, a threaded shell connected to the base and electrically connected to said casing, said shell being adapted to be screwed into the shell of the socket so as to establish electrical connection between the same and one end of the lamp filament, a contact member mounted upon the upper end of the lamp base and adapted to be engaged by the contact member of the lamp socket, and means for securing the body of the lamp base to the threaded casing carried thereby so 'as to permit independent rotation of the base, said means also serving to secure the contact member of said lamp to the upper end of said base.

In an'incandescent lamp, a base provided with a easing of electrical conducting material, one end of the filament of lsaid lamp being connected to said casing, a shell disposed in concentric spaced relation to said casing, said "shell and casing being electrically connected together, means for secan ing the base and shell together so as to permit independent rotation of said base in either' direction, and a main contact member connected to the other end ofthe filament of the lamp by said securing means and so connected thereto as to permit free rotation of the lamp inde| ')endently of the con tact member.

In testimony whereof I affix my signature 1n presence of two witnesses.

WILLIAM I. KEMBLE.

Witnesses JAMES J. (.irLovEn, lVA'rsoN I1. GREENE. 

